Unit 9: Echinoderms

The word “echinoderm” means

• big foot
• hairy toe
• tube feet
• spiny skin

What type of symmetry do most echinoderms have?

• bilateral
• assymetry
• pentaradial
• pentalateral

Which of the following is NOT a function of tube feet?

• filter water
• catch food
• grip surfaces
• move along surfaces

Water enters a starfish through an opening called the ___.

• madreporite
• tube feet
• ampullae
• mouth

Which of the following is NOT a characteristic of echinoderms?

• 5 part radial symmetry
• endoskeleton
• cephalization
• water vascular system

The anus of a starfish is located:

• on the aboral surface
• on the oral surface
• at the tip of the arms
• Sea stars do not have an anus

Choose the correct path of water in a sea star's water vascular system.

• Madreporite - stone canal - ampullae - ring canal - radial canal - tube feet
• Madreporite - stone canal - ring canal - radial canal - ampullae - tube feet
• Madreporite - ring canal - radial canal - stone canal - ampullae - tube feet
• Madreporite - radial canal - stone canal - ampullae - tube feet - ring canal

These echinoderms can burrow into the sand and feed on decaying matter.

• sea urchins
• sea stars
• brittle stars
• sea cucumbers

True or False? Only the sea star has tube feet.

• True
• False

True or False? Starfish can regenerate lost body parts.

• True
• False